Pixiq has a great write up on the similarities and differences between the human eye and a camera. Apparently, we're the same in image focusing and light adjustment but different in lens focus and sensitivity to light. What else?

Pixiq's breakdown gets even more interesting when they explain how cameras work like our eyes. The cornea acts like a lens, the iris and pupil act like the aperture of a camera and the retina is like the imaging sensor of a digital camera.

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There's much more interesting tidbits in their piece and I suggest you skim it all, you might even find out what the ISO of a human eye is. [Pixiq]